Question

An opinion poll randomly surveyed 1,700 people. The polling organization found the percentage of the sample that said the country is going in a positive direction. The margin of error of the confidence interval based on these results is ______ percentage points. Round your answer to the nearest tenth of a percentage point.

Based on an opinion poll, a polling organization reported that they are 95% confident that between 48.9% and 55.3% of all adult Americans feel the country is going in the wrong direction. The margin of error of this poll is _______ percentage points.

IQ scores are approximately normally distributed with a mean of 100 and a standard deviation of 15. Use the 68-95-99.7 Rule to answer the following question. What percent of people have IQs between 70 and 115?

Answer #1

A polling organization conducts a poll by making a random survey
of 2300 people. Estimate the margin of error at a confidence level
of 95% using the rule of thumb for the margin of error. Round your
answer as a percentage to one decimal place.

A polling company conducts an annual poll of adults about
political opinions. The survey asked a random sample of 314 adults
whether they think things in the country are going in the right
direction or in the wrong direction. 51% said that things were
going in the wrong direction. How many people would need to be
surveyed for a 90% confidence interval (z*=1.645) to ensure the
margin of error would be less than 3%? Round your answer to the
appropriate...

You are consulting for a polling organization. They want to know
how many people they need to sample, when predicting the results of
the gubernatorial election.
If there were 100 people polled, and the candidates each had
50% of the vote, what is the standard error of the poll?
If there were 200 people polled?
If there were 400 people polled?
If one candidate were ahead with 60% of the vote, what is the
standard error of the poll?
They...

A polling company conducts an annual poll of adults about
political opinions. The survey asked a random sample of 2354 adults
whether they think things in the country are going in the right
direction or in the wrong direction. 62% said that things were
going in the wrong direction. Complete parts a and b below.
a) Calculate the margin of error for the proportion of all
adults who think things are going in the wrong direction for 95%
confidence.

A polling company conducts an annual poll of adults about
political opinions. The survey asked a random sample of 314 adults
whether they think things in the country are going in the right
direction or in the wrong direction. 51% said that things were
going in the wrong direction. Calculate the margin of error for the
proportion of all adults who think things are going in the wrong
direction for 95% confidence. (Use z*=1.96) Round your answer to 4
decimal...

A polling organization found in 1996 that 57% of people in a
large country are concerned about global warming, up from 54% in
1995. Results for this poll were based on telephone interviews
conducted in 1996, with a random sample of 1424 adults, aged 18
and older, living in the country. Does the increase from 1995 to
1996 show a significant increase in concern?
Question: Perform the test and find the P-value. What
is the test statistic?
______________________________________________________________
Question: What...

A polling company conducts an annual poll of adults about
political opinions. The survey asked a random sample of 2190 adults
whether they think things in the country are going in the right
direction or in the wrong direction. 43% said that things were
going in the wrong direction. Complete parts a and b below.
a). Calculate the margin of error for the proportion of all
adults who think things are going in the wrong direction for 90%
confidence.
b). Explain...

The margin of error means that if this poll were conducted many
times, we would expect that at least 95% of the time the actual
number of people in the population that would give a particular
response is somewhere between - the margin of error
and + the margin of error. - the margin of
error and + the margin of error.
3.On December 18, 2015, an organization called Public Policy
Polling released the results of a poll with 532 responses. Of those
respondents,...

During election season you will constantly see polls estimating
the percentage of people who will vote for candidate A and
candidate B. These polls are misleading because they always show
the point estimate, p-hat, when they are really confidence
intervals. If you look closely, the graphics will show in small
print away from the results a statement saying something like "this
polls has a margin of error of +/- 3 points".
Consider the following: You see a news article stating...

Recently, the number of children Americans have has dropped. The
Gallup Poll organization wanted to know whether this was a change
in attitude or possibly a result of the recession, so they asked
Americans whether they have children, dont have children but wish
to, or dont want children. Out of a random sample of 1200 American
adults in 2013, 1140 said that they either have children or
want/wish to.
(a) Suppose the margin of error in the confidence interval above...

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